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He told Fox News a "wiretap covers a lot of different things" and hinted more could emerge in the coming weeks.
Mr Obama has denied the charge and former spy chiefs and several lawmakers have said they have seen no evidence.
The latest senior figure to cast doubt on the allegation was the Republican chairman of the House intelligence committee.
Devin Nunes said on Wednesday he doesn't believe "there was an actual tap of Trump Tower".
Earlier this month, Mr Trump tweeted that President Obama had wiretapped his phones during the presidential campaign.
In a series of tweets, he accused his predecessor directly, asking: "Is it legal for a sitting President to be 'wire tapping' a race for president?"
Talking to Fox News in an interview that will be broadcast in full on Wednesday night, the president made his first comments about the wiretap accusation he made two weeks ago.
He said:  "Wiretap covers a lot of different things. I think you're going to find some very interesting items coming to the forefront over the next two weeks."
Despite repeated requests from reporters, the White House has not provided any evidence to support the president's claim.
White House Press Secretary Sean Spicer has said Mr Trump "used the word 'wiretap' in quotes to mean broadly surveillance and other activities".
And he was not accusing Mr Obama personally, Mr Spicer said.
Mr Trump asked Congress to examine the allegation as part of an investigation into alleged Russian meddling in last year's election.
Senator Lindsey Graham, who is leading the Senate Judiciary Committee's investigation of allegations of Trump-Russia ties, has pressed the FBI to come forward with more details of its own probe into the issue.
Mr Graham said on Wednesday he would use a court order to force FBI Director James Comey to submit details on its Russian investigation and whether there was any evidence of Mr Trump's phones being wiretapped.
Mr Comey promised on Wednesday to provide answers in a classified briefing.
US intelligence agencies found that Russia conducted cyber-attacks against the Democratic Party as part of an effort to influence the election in Mr Trump's favour.
Russia has repeatedly denied any involvement.
Mr Trump has been dogged by claims that his advisers and staff had ties to Russian officials, but there has been no evidence of any collusion between his campaign and Moscow.
US President Donald Trump has stood by his unsubstantiated claim that Barack Obama wiretapped Trump Tower last year.

7 January 2016 Last updated at 11:40 GMT
She told BBC Asian Network's Anisa Kadri she was "flabbergasted" when she walked into the exam hall as everyone was much older than her.
Anushka, from Isleworth, west London, says she loves creative writing and wants to join the society's specialist group.
Eleven-year-old Anushka Binoy has scored the maximum 162 to get into the high-IQ society Mensa.

The ex-Labour prime minister is closing his lobbying and consultancy business, Tony Blair Associates, and associated companies Windrush and Firerush.
In an email to staff, he said while he would retain a small number of commercial contracts, 80% of his time would be spent on not-for-profit work.
He has been criticised for the amount of profit the ventures have generated.
Mr Blair, who left frontline politics in 2007, is reported to have made millions advising a number of foreign governments and multinational firms.
Although the full range of his business activities has never been disclosed, Mr Blair was reported to have been paid Â£2m a year alone by JP Morgan after leaving office.
Earlier this year, it was claimed he had a lucrative deal advising the Kazakh government.
His links with Kazakh president Nursultan Nazarbayev, who has ruled the country since 1989 and whose human rights record has been condemned, have been controversial.
Mr Blair, however, has rejected claims of any conflict of interest between his commercial and his not-for-profit work.
His not-for-profit ventures include his Faith Foundation and the Centre for Geopolitics and Religion, which focuses on addressing the root causes of Islamist extremism and supporting inter-faith dialogue.
Following a review of his business interests, Mr Blair said he had decided to refocus his activities and would give the "substantial financial reserves" generated by his businesses in recent years to not-for-profit causes.
In an email, he said: "Over the past nine years we have built a group of organisations employing around 200 people and working in more than 20 different countries round the world. It is time to take this to a new level.
"As I indicated last December at our annual all staff meeting, I want to expand our activities and bring everything under one roof.
"I also want now to concentrate the vast bulk of my time on the not for profit work which we do. De facto, this has been the case in the past two years but we need to reflect this change in the way we are structured."
He added: "I will retain a small number of personal consultancies for my income, but 80% of my time will be pro bono on the not for profit side."
Mr Blair, who is 63, was prime minister between 1997 and 2007. After stepping down, he served as a Middle East envoy for eight years. He and his wife Cherie also have substantial property investments in the UK.

Tony Blair has said he is winding up most of his commercial ventures to focus on not-for-profit work.

